Make it possible to temporarily change the domain (ie. to update settings on another domain)

At the moment it's impossible to unset things from config in another domain - fix allows you to temporarily change the domain - as in

foreach ($existing['values'] as $domainID => $domainSettings){
CRM_Core_BAO_Domain::setDomain($domainID);
$missing = array_diff_key($allSettings['values'], $domainSettings);
foreach ($missing as $name => $settings)

{ self::convertConfigToSetting($name, $domainID); }

CRM_Core_BAO_Domain::resetDomain();
}